The flux of terrestrial dissolved inorganic phosphorous (DIP, i.e. PO₄³⁻) via rivers into coastal seas is usually calculated by simply multiplying its concentration with the corresponding water flow at the river mouth. Subsequent adsorption/desorption of DIP onto suspended sediment and the influence of salinity in the estuary are often overlooked. A series of DIP adsorption/desorption experiments under different salinities (0, 5, 15, 30) and suspended sediment concentrations (1–40 g L⁻¹) were conducted in order to assess the potential influence of these factors on the overall DIP loading to the coastal zone. The effect of different sea-salt ions on DIP adsorption/desorption was also assessed by comparing different experimental solutions (NaCl solution, artificial seawater and real seawater). In estuaries, the adsorption of DIP to suspended sediments was greater than desorption, and the net adsorption increased with increasing concentration of suspended sediments and salinity. This enhanced DIP adsorption onto suspended sediment reduces the riverine discharge of DIP to coastal ecosystems. Disregarding this process, especially for the gated estuaries with high sediment resuspension, potentially leads to an overestimation of the terrestrial DIP input to the coastal region.

陆地溶解无机磷（DIP，即PO ₄ ^3-）通过河流进入近海的通量通常通过简单地将其浓度乘以相应的河口水流量来计算。随后 DIP 对悬浮沉积物的吸附/解吸以及河口盐度的影响往往被忽视。在不同盐度（0, 5, 15, 30）和悬浮泥沙浓度（1-40 g L ^-1) 是为了评估这些因素对沿海地区整体 DIP 负载的潜在影响。还通过比较不同的实验溶液（NaCl 溶液、人工海水和真实海水）来评估不同海盐离子对 DIP 吸附/解吸的影响。在河口，DIP对悬浮泥沙的吸附大于解吸，净吸附量随着悬浮泥沙浓度和盐度的增加而增加。这种对悬浮沉积物的增强的 DIP 吸附减少了 DIP 向沿海生态系统的河流排放。忽视这一过程，特别是对于沉积物重悬浮的门控河口，可能会导致对沿海地区陆地 DIP 输入的高估。